I recall from somewhere that checking "Force own texture" on the layer props will solve rendering bugs with the Mask effect as well as a couple of others.
I can't be arsed to try right now, I just woke up and I haven't had my coffee yet.
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Thanks for the reply, deadeye!
Well, "Force own texture" was there, but it had no effect on the trail problem...
Thanks for the tip! Have a nice breakfast!
No need to thank me if it didn't work.
Post your .cap so someone can help figure out what's wrong.